Gates’ fortune is valued at $72.7 billion and was aided by significant rises in Microsoft stock. The stock has risen 28 percent so far this year and Gates’ wealth has jumped by $10 billion.

At the same time, Slim has seen his fortunes reverse slightly. His net worth dropped by $2 billion this year as the Mexican Congress passed a bill designed to break up the virtual monopoly of his telecommunication company America Movil SAB.